Ring brush



FIG. 1 is a perspective view of a ring brush showing my new design;

FIG. 2 is a front view thereof, the back view being a mirror image;

FIG. 3 is a right-hand view thereof, the left-hand view being a mirror image;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a ring brush, as shown and described. 